I don't really think that per-capita income is a good measure of how wealthy a given area is; I think on per-capita income, the wealthiest county in NY is New York (Manhtten) ? Which is an absurdity when you consider quite how poor large tracts of the borough are (in both relative and *absolute* terms).
IMO a wealthy area shouldn't include large numbers of poor (or even working class!) people.
Well, then you're going to have a great deal of difficulty with some states; looking at that list, many states' highest per capita income counties are below the national average (~$35,000)!
